FCC thin metal films often find use in optical coatings and microelectronics applications. However, a texture transformation from small (111) oriented grains to large (100) grains can drastically change the mechanical properties of these films. This transformation has been attributed to a competition between strain and interface energies, but, we have shown that nanotwins can both provide the necessary driving force and account for the selection of the (100) orientation during texture transformation in Ag films. In this work, we show that (a) nanotwins can be created in evaporated Ag films (previously only seen in sputtered films), (b) films produced at increasing deposition rates show a corresponding increase in nanotwin density, and (c) films with greater nanotwin densities transformed further and faster than films with fewer nanotwins. These results strongly suggest the (111) to (100) texture transformation in thin films is due to the presence of nanotwins.